Right now, clear_trackexithosts_mappings(exitname) removes all mappings that came from TRACKEXIT where the original address of the mapping ends with .exitname.exit , when in fact it should remove entries whose _remapped_ address ends with .exitname.exit. This is called out with a new comment in my bug1090-part1 branch. It'll want to get fixed _after_ legacy/trac#1090, which also touches that and some related code.